android 控制屏幕亮度
16lz
2021-01-23
如何在Android中如何控制调节屏幕亮度
Android的屏幕亮度好像在2.1+的时候提供了自动调节的功能,所以,如果当开启自动调节功能的时候, 我们进行调节好像是没有一点作用的,这点让我很是无语,结果只有进行判断,看是否开启了屏幕亮度的自动调节功能。
1 2 3 4 5 6 7 8 9 10 11 12 13 | /** * 判断是否开启了自动亮度调节 */ public static boolean isAutoBrightness(ContentResolver aContentResolver) { boolean automicBrightness = false ; try { automicBrightness = Settings.System.getInt(aContentResolver, Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; } catch (SettingNotFoundException e) { e.printStackTrace(); } return automicBrightness; } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | /** * 获取屏幕的亮度 */ public static int getScreenBrightness(Activity activity) { int nowBrightnessValue = 0; ContentResolver resolver = activity.getContentResolver(); try { nowBrightnessValue = android.provider.Settings.System.getInt( resolver, Settings.System.SCREEN_BRIGHTNESS); } catch (Exception e) { e.printStackTrace(); } return nowBrightnessValue; } |
1 2 3 4 5 6 7 8 9 10 11 12 | /** * 设置亮度 */ public static void setBrightness(Activity activity, int brightness) { // Settings.System.putInt(activity.getContentResolver(), // Settings.System.SCREEN_BRIGHTNESS_MODE, // Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); WindowManager.LayoutParams lp = activity.getWindow().getAttributes(); lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f); activity.getWindow().setAttributes(lp); } |
嘿嘿,那是因为,开启了自动调节功能了,那如何关闭呢?这才是最重要的:
1 2 3 4 5 6 7 8 | /** * 停止自动亮度调节 */ public static void stopAutoBrightness(Activity activity) { Settings.System.putInt(activity.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); } |
1 2 3 4 5 6 7 8 9 10 | /** * 开启亮度自动调节 * * @param activity */ public static void startAutoBrightness(Activity activity) { Settings.System.putInt(activity.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC); } |
哎,本来认为是应该结束了,但是悲剧得是,既然像刚才那样设置的话,只能在当前的activity中有作用,一段退出的时候,会发现毫无作用,悲剧,原来是忘记了保存了。汗!
1 2 3 4 5 6 7 8 9 10 11 | /** * 保存亮度设置状态 */ public static void saveBrightness(ContentResolver resolver, int brightness) { Uri uri = android.provider.Settings.System .getUriFor( "screen_brightness" ); android.provider.Settings.System.putInt(resolver, "screen_brightness" , brightness); // resolver.registerContentObserver(uri, true, myContentObserver); resolver.notifyChange(uri, null ); } |
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